Line artifact in render?
It's hard to tell the exact problem here without a blendfile but it seems like you used ngon's for the mesh (polygons with more then 4 vertices). For hard surface modeling this is usually fine but it can lead to artifacts because cycles converts them to multiple triangles. here this might mess up your topology when many triangles (that are generated because of the holes for the buttons in the mesh). One simple thing you could try is to make sure your plane is completely flat. just select the whole plane and press S+Y(or X- depends on how you rotated it earlyer).+0


editmode and what cycles does with it